ESPN's Daily Dime has listed the greatest centers one through ten.
The Sports Guy disputes the merits of a list like this. I tend to agree with his argument that it is a vague question, with no answer. Does it mean career? How do you adjust for the era a center played in? Is it, which center are you taking to win one game? At the same time, that stance isn't much fun.
Pacifist Viking supports the choice of Kareem at #1, but calls attention to some serious rebounding stats Chamberlain had.
For my money, I'm taking "The Dream."
I'm not a stat freak, but some (not really "real" stats anyway) I will highlight are: Aside from Jordan, Olajuwon is the only player to win Defensive Player of the Year and MVP, in the same season. He also won Finals MVP, the only player to ever win all three in one season. He is the only center on this list, (I think, please correct me if I'm wrong) to beat three other centers (O'Neal, Robinson, and Ewing) on this list, in meaningful championship match-ups.
After Jordan's first retirement, Olajuwon filled the gap and became THE must watch player. For the seasons of 93-94 & 94-95, he was as unstoppable as any player I ever watched. His abusive treatment of Robinson, in the 94-95 Finals, is one the great moments in sports when one player separates themselves from their contemporaries.
Olajuwon was a master artist creating a masterpiece. Second place wasn't that close.
Usually people take for granted, that if Jordan had not retired, the Bulls would have won eight titles. This Bulls fan was never so certain.
(Additionally, True Hoop has a pretty good debate going in his comment's, and with The Sport's Guy on this subject. Thanks for the linkage, Pacifist Viking!))